discovery 2200

I'm new to posting, but I have been reading all of your posts on this forum and they are so helpful and great. I have searched for plenty of answers to my questions, but I have a few more. Hopefully someone can help. I started with a Bounty Hunter Discovery 2200 about 2 years ago. Like...

I have a BH Elite 2200, which I understand is the same as the Radio Shack Discovery 2200. It has an 8-inch coil and works pretty well, right out of the box. However, I thought maybe a larger coil would increase the depth of the targets I could detect. Has anyone found a source of larger...